Hey there hon-
I don't know about other sororities, but Chi O has a national rule that you must be involved in at least 2 other outside groups to maintain good standing. So, this stuff about being too busy... ignore it. You know your schedule, and you can take on whatever you think is right for you. I was premed in school and involved in a number of different activities-- I went abroad, I volunteered outside of Chi O for 4 years, held multiple on campus jobs—all sorts of stuff, and I was on exec my sophomore year. Getting to know people is the best advice I can see… other than that, have fun and be yourself! Good luck to you and finding a home
-M
ps- and I'm going to USC med school in the fall. :-)